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Part General Description Chapter 1 The object of this Manual In Japan the Water Pollution Control Law and the prefectural stringent effluent
standards set forth by the prefectural ordinances regulate the effluent from factories and other
establishments. These regulations have helped to promote the development and use of excellent
wastewater treatment equipment and systems in Japan. The effluent standards are set forth in
accordance with the environmental conditions. The wastewater treatment process is decided to
meet the effluent standards, while allowing for neighborhood circumstances, economics,
operability, maintenance ease, extensions, and other such factors. Therefore, since it is difficult
to provide a simple description of this optimum process, this manual describes technical aspects
together with the background of the related laws, economics, and other factors, which should all
be considered when any factory or other establishment plans to construct a wastewater
treatment facility.
In section 1, the perspectives on global environmental conservation, effluent water
regulations, economics, safety, and other aspects are mentioned in order to clarify the basic
stance for wastewater treatment. In addition, the movements of environmental assessment, life
cycle assessment, and related items are introduced to address the recent demands for
accountability concerning the environmental impact caused by production. ‘No-regret’
strategies, including unproven ones, are required to address today’s environment conservation
issues, in addition to economic evaluation, which has not always been sufficient.
In section 2, the fundamental technical aspects are described as references for
constructing wastewater treatment plants, modernizing existing plants, and operating
solutions for problems. References are provided as much as possible for further study.
In section 3, various practical results from wastewater treatment in the food
processing industries are introduced. The facilities, equipment, and technologies introduced
here are simply examples as previously mentioned, since they should be carefully chosen to
meet varied conditions including neighborhood circumstances and economics. As almost all the
properties of the wastewater treatment systems including performance, economics,
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maintenance ease, and operability are fixed when selecting the process, comprehensive and
comparative study, including all the alternatives, is desired to choose the process.
Chapter 2 Basic concept and direction of industrial wastewater treatment Industrial wastewater control aims at decreasing the environmental impact caused by
production. Nevertheless, production cannot avoid exerting a damaging influence on the
environment. Some criteria for accessing this impact are also required. As one measure, the
effluent control system should definitely be part of the corporate environmental control system.
The corporate environmental control system is a plan to successfully implement a management
policy for environmental conservation, which shall continue to be upgraded with the PDCA
(Plan Do Check Action) cycle containing the following items:
(1) Environment Policy
Make the purposes and goals of environmental conservation, regulations, and other
pledges known to every one in the organization in order to improve the environment on an
ongoing basis and to prevent pollution.
(2) Implementation Plan
Review the organization in order to reach the goals, settle the environmental
conservation purposes and goals, and the scheduling and investment of funds and
manpower.
communication rules, writing required, and action programs for emergencies.
(4) Check and Correct
(5) Review by Board Members
Today, an understanding that the wastewater treatment facility deserves part of the
production lines is necessary. Further understanding of the responsibility for explaining the
pollution load to the public, which is accountability for environmental control, is growing. These
issues are reflected in the formation of environmental management programs, recycling,
qualitatively acquiring ISO 14001 certification, quantitative life cycle assessment (LCA), and
other such items. This means that wastewater treatment shall be comprehensively considered
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as part of the environmental issues to be addressed, which include the green house effect, ozone
layer depletion, acid rain, soil contamination, smells, vibration, and other important problems.
Chapter 3 Environmental Consideration for Industrial Wastewater Treatment The industrial wastewater treatment plant purifies the wastewater while consuming
large quantities of energy and chemicals, and also generating excess sludge that burdens the
environment. The life cycle assessment instructs how to quantitatively understand the
environmental impact. For example, the environmental impact from the wastewater treatment
can be counted by the effluent volume of BOD, COD, SS, and other such substances in the
water areas, waste material volume carried out, carbon dioxide volume emitted, and energy
consumption. As the environmental impact from industrial wastewater treatment is hard to
evaluate using only one of these parameters, several appropriate parameters shall be selected
to meet the local conditions. Meanwhile, if methane is recovered as a useful substance from
fermenting organic matter in wastewater and used for fuel, the total energy balance at the
factory is to be evaluated, taking the methane gas into account. When converting sludge to
fertilizer, the economic evaluation is easy. If it is evaluated from the environmental impact
perspective, however, then other environmental impacts, including the complicated
transportation, shall be evaluated along with the comparison with alternative sludge disposal
methods. Though these complications need to be simplified, the antinomy would cause the
actual evaluation on the other side to be lost.
In recent years, responsible care, as part of the environmental management system,
has become widespread among many enterprises internationally that are exploring it along
with sustainable growth. Accordingly, the PRTR (Pollution Release and Transfer Register) was
legislated on March 2,000 in Japan. This regulation aims at businesses estimating the
quantities of chemical substances used or produced by them, that are released in the rivers, air,
soil, and transferred in the waste, and then reporting that data to the central government for
official publication. There are 354 substances that are designated as Class 1 substances and 81
substances designated as Class 2 substances. The PRTR applies to sewage and industrial waste
treatment facilities/disposal services other than those of manufacturers. When transferring or
supplying designated substances to other businesses, the transferring business shall provide
the transferee, before the transaction, with information by means of MSDS (Material Safety
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Data Sheet), which was regulated at same time, on the properties and handling of the chemical
substances in order to prevent leakage into the environment. The Class 1 chemical substances
are hazardous to human health and ecosystems and widely exist in the environment. The Class
2 chemicals are hazardous too, but the environment is exposed less to them than the Class 1
chemical substances. This applies to the coagulants, neutralizers, deformers, and other
chemicals used in wastewater treatment.
As mentioned before, the environmental impact caused by wastewater treatment
shall be considered from various perspectives, which are summarized in Figure 1-3-1.
Figure 1-3-1 Consideration of environment impact at wastewater treatment
Chapter 4 Water Area Conservation and Environmental Assessment
4-1 Environmental Assessment
The businesses that will impact the water areas, air, and soil must assess their impact
on the environment and take the appropriate measures. The principle idea of the
Environmental Impact Assessment shall mean the process of surveying, predicting, and
WASTEWATER TREATMENT
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assessing the likely impact of a project; determining if it will be built; and if proper
consideration is given to protecting the environment. In Japan, practical environmental
assessment began in 1992 when the Cabinet decided on “Countermeasures against
Environmental Pollution Caused by Public Businesses” and, following the overall enactment of
the Environmental Impact Assessment Law in June 1999, prefectural and municipal
governments legislated their own ordinances in compliance with the Law. The situation
concerning environmental assessment drastically changed after that. The Environmental
Impact Assessment Law is applied extensively to projects other than Class 1 Projects. Class 1
Projects are large-scale projects such as roads, airports, dams, power stations, and the like. The
Environmental Impact Assessment Law was applied initially to Class 1 Projects, which include
large-scale construction projects such as roads, airports, dams, and power stations. In years
after, however, local governments enforced stricter standards by down-sizing the project scale,
adding requirements, and widening the category for application. Therefore, in case of factory
construction and facilities modification, implementing environmental impact assessment may
be required in accordance with ordinances, which affects the cost and delivery term in the
project.1
4.2 Environmental Assessment System
The environmental assessment system is generally classified into two types of
assessments, those conducted by the proponent and those by a third party. These are conducted
at the planning stage (project assessment), commencement stage (business assessment), and
business stage (post facto assessment) in consideration of the project progress. If a project is
subject to the environmental assessment system, the project proponent shall fill in the
‘Environment Impact Evaluation Methods Report’ form and submit it to the prefectural
governor, who sends it to the mayors of the local bodies involved, who then make it available for
public review. Then, the proponent shall fully consider public opinion and fill in the
‘Environmental Impact Assessment Report’ form, prior to starting the project. If an
environment impact investigation is required after commencing construction, then a post facto
assessment shall be conducted.
4.3 Screening
Under the new Environmental Impact Assessment Law, if a project scale is above a
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certain threshold level, the relevant administrative agency must assess the project, even if it
does not meet the requirements set forth by the Law. This procedure is called screening. Some
local governments apply screening to some Class 1 and Class 2 projects, while others assess all
the projects whose scale is beyond the level determined by the Law without screening.
4.4 Scoping
Scoping means that the proponent decides the investigation items, investigation
method, evaluation procedures, and related items, after fully considering the comments in the
Environmental Impact Evaluation Methods Report. As to water pollution control, the water
quality standards based on the Basic Environmental Law are stipulated for protecting human
health and conserving living standards. The 26 substances such as heavy metals, chlorinated
organic compounds, and agricultural chemicals are designated to protect human health, and 9
additional items such as pH, dissolved oxygen, suspended solids, biochemical oxygen demand,
chemical oxygen demand, total nitrogen, and total phosphorus are designated for conserving
living standards. The former standard is uniformly applied everywhere in Japan, and the latter
is established for rivers, lakes, and coastal waters. The predictions for water quality changes in
the effluent connected water areas are estimated by the effluent pollutant load as a qualitative
approach, or by a computational diffusion model as a quantitative approach. Environmental
assessments other than water pollution are for the air and an aquatic biota.
4.5 Environmental Impact Statement
The measures for environmental conservation shall be planned first. In this stage, the
objects and goals for environmental conservation measures are clarified based on information
during the scoping and investigation-prediction such as the basic policy of environmental
conservation, business properties, local conditions, targets of local environmental basic policy,
comments on the scoping document, and impact prediction results. At the next stage,
countermeasures to avoid or reduce or compensate for adverse impacts shall be comparatively
studied repeatedly, until the most appropriate implementation plan is selected. The plan should
be studied in detail at each engineering stage including the location, layout, and size-structure;
facility-plant and landscaping; operation and maintenance; and construction procedure. The
environmental impact assessment should be made by the proponent stating whether the
selected conservation measures can avoid or reduce the predicted impact.
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4.6 Post Facto Assessment
The objective reasons shall be expressed in a statement by a proponent. If the impact
assessment statements are judged as extensively uncertain concerning the effectiveness or
influence of measures, or the impact on other environmental factors, then post facto assessment
shall be conducted. The post facto assessment results and supplemental measures, if required,
shall be made public.
Investigation Results of Environmental Assessment, Engineering Advancement Association
of Japan
Chapter 5 Production Process Improvement Judging from Industrial Wastewater Treatment
The pollution control measures have mainly been focused so far on satisfying the
regulations regarding water, air, and waste materials emitted from factories in Japan. In
addition to these ‘end-of-pipe’ measures, more comprehensive measures are desirable for
pollution control, which include reducing waste material generation by improving production
lines, which is called cleaner production, and saving energy and resources such as electric
power and water.
5.1 Wastewater Treatment by End-Of-Pipe Measures
The pollution control measures at the end-of-pipe have been making great
contributions to reducing the pollutants discharged into the environment by businesses.
However, this accompanies an investment in production facilities, which constantly raises
production costs with daily operations, maintenance, and depreciation expenses. The energy
consumed and waste materials generated also burden the environment. To address these issues,
enterprises shall implement environmental control for global environmental conservation along
with security management for the safety of facilities and public reliability on top of economic
management for delivery terms, costs, quality, and other such factors.
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(1) Cleaner production advantages
Cleaner production is a production system in which raw materials are re-selected,
production technologies are reformed, and entire production processes are re-structured so that
the energy consumption and waste volume can be reduced. This is also called
in-process-technology. The pollution control measures accomplished by the
in-process-technology in the past prove that production cost is reduced together with resources
and energy savings. If it is introduced to developing countries, which need to invest their money
effectively, it will become a part of useful and effective ‘no-regret’ strategies. As well known
references for cleaner production, pulp industries in Japan produced about 13,000,000 tons
per year of paper and cardboard in 1970 and discharged an estimated 2,200,00 tons of COD. In
1989, 19 years later, the annual production had increased to 26,800,000 tons, which ought to
emit 4,500,000 tons of COD by simple proportional calculation. The actual discharged COD was
estimated at only 200,000 tons. A total of 84% of the COD was decreased as follows. Cleaner
production accounted for 58% of the reduction by improvements in the production process and
another 26% was decreased by recovering the black liquor. If pollution control measures are
solely taken at the end-of-pipe, a huge amount of money should be invested in wastewater
treatment plants.
(2) Approaching cleaner production
The latest measures for the environment tend to manage reducing environmental
impact by corporations, including the board members. This is symbolized by the acquisition of
the environmental management system of the International Standard Organization (ISO
14000 series). The independent relationships in the factory between the production and
environmental management groups fulfill these functions from the inspection perspective such
as quality assurance. This independence, however, obstructs the command of a bird’s eye view
of rationalization, according to the time and circumstances. The importance of the cleaner
production measures is to comprehensively understand the material flow in the factory. For
that, actual investigation of the volume of wastewater and effluent generated is necessary. In
the investigation, the water, BOD, COD, SS, total nitrogen, and total phosphorous shall be
counted for the volume going-in-and-out of the factory and the discharge at each discharge point
shall be understood. The data obtained shall be weighed by a method such as the Pareto
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Diagram, which can arrange the outlets in order of their pollutant rank and allow the factory to
determine which discharge points should be prioritized. All the people working in the factory
shall also learn the state of the pollutants discharged too. The material flow shall be analyzed
using the items described in Figure 1-3-1. Based on this analysis, a feasibility study for the
planned countermeasures should be conducted, properly considering the estimated cost, and
then the execution of reduction measures shall be given priority according to their cost
effectiveness.
(3) Decreasing Input Materials
The raw material is usually selected to produce high quality goods swiftly at the
lowest cost. Therefore, changing the raw material is not that easy for reducing the pollutants
by using cleaner production alone. As the leakage of raw material shares a major portion of the
pollutants in wastewater, however, changing raw materials could reduce the pollutant
discharged. This is provided that the product value of the taste and other factors would not be
affected, and that the total cost of production and wastewater treatment could generate an
advantage.
(4) Improving Production lines
The most effective method for reducing pollutants is improving the production process.
The Food Recycling Law recommends recovering and recycling waste materials generated from
the factory as solids, as much as possible. Some examples for reducing wastewater volume and
pollutants are mentioned below including recovering and recycling waste materials.
1. Daily Dish Processing2)
This factory recovers methane gas from a high concentration wastewater stream
using an anaerobic treatment plant. The low concentration wastewater is treated with
air-floatation added by coagulation and discharges it into the sewers together with effluent from
the anaerobic treatment plant. The factory obtained ISO 14001 in 1999 and improved the
separation of waste materials in the factory and significantly reduced the wastewater volume of
the high concentration wastewater stream as shown in Table 1-5-1, working under the slogan of
“Improve Effluent Quality.” In contrast, the low concentration wastewater increased its volume
and pollutants. From now on, separated collection systems should be further developed and
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improved. The merits of methane gas recovery will be raised by decreasing the low
concentration wastewater volume and increasing the load to the digestion tank by feeding more
high concentration wastewater. The factory succeeded in reducing wastewater volume and
pollutants in the high concentration wastewater stream by improving the processing practices.
For the low concentration wastewater, the further recovery of methane is planned by one option
of reducing the water when further reducing leakage from the raw materials becomes difficult.
Table 1-5-1 Wastewater improvement at daily dishes processing
2) Sake Brewery
The largest amount of pollutants comes from the rice-rinse processing in the sake
brewery. This factory removes the rice bran with a rotary sifter without water after rice
polishing. As a result, both the wastewater volume and pollutants from the rice-rinse
processing are reduced, which leads to no sedimentation in the settling tank. The latest
rice-rinsing machine can reduce the wastewater volume by recirculating used water. In this
case, the wastewater concentration becomes higher and separating the sedimentation becomes
easier. The wastewater volume from the rinsing process varies from one to two times depending
on the operating procedures. The returned bottles are seldom washed at the sake-factory and
are usually washed at the bottle rinsing factory, which usually, depending on the local
conditions, discharges the wastewater with BOD of several mg/l at the highest into the sewers
after pH adjustment alone.
stream n-Hexane extr. (mg/?) 110 74
Wastewater (m3/d) 1,050 600
stream n-Hexane extr. (mg/?) 50 56
Wastewater (m3/d) 550 650
pH 59 7.2
SS (mg/?) 200 41
Wastewater (m3/d) 1,900 1,300
Effluent includes 300m 3 /d of wastewater from machine room
Design Figures Result (Average)Item
3) Milk Product Factory
The equipment in this factory is washed in a sequence of pre-washing,
internal-washing, acid-washing, semi-final-washing, and final-washing. The effluent from the
final-washing is not reused because of the high contamination from the milk. The effluent from
the final washing is reused for pre-washing. Although the effluent from the internal-washing
was thought not to be reusable due to the detergent in it, the membrane filtration shown in
Figure 1-5-1 made it possible to reuse 150 m3/day for make-up water for the cooling tower and
rinse water.
4) Confectionary Factory
This factory manufactures sponge cake and fruit jelly. In sponge cake production
many eggs are consumed and the washing water from the egg-crusher is a main source of BOD.
Compressed air is used to remove the remaining whites and yolks of eggs inside the machine,
reducing 30% of the total BOD of the sponge cake production at the origin. In fruit jelly
production, spilling syrup from cans causes major fluctuations in wastewater strength.
Therefore, installing a spill wall for the whole can-opening working place is under study to
/
recover the spilled syrup.
Thus the reduction measures for pollutants are being done in various ways such as
improving operating methods, changing processes, wastewater divided treatment, water
recycling, and recovering spills as shown in the above examples.
(5) Worker Education
The important thing in cleaner production is to continuously improve the
environmental management system using the PDCA cycle mentioned in chapter 2, for which
the driving forces necessary are the training, self-consciousness, and capabilities of the
members in the organization. Motivation and incentives are important factors to make the
members of organizations aggressively tackle improvement.
References
1) Pollution Control Technical Manual (Pulp and Paper Industry). Japan Environment
Corporation (1998).
2) Fukushima, T. Daily Dishes, The Most Appropriate Treatment Handbook for Food
Processing Wastewater. Science Forum. (2002)
3) Watanabe, T. Sake, The Most Appropriate Treatment Handbook for Food Processing
Wastewater. Science Forum. (2002)
4) Yazaki, M. Milk Products, The Most Appropriate Treatment Handbook for Food Processing
Wastewater. Science Forum. (2002)
5) Ohnishi, M. Confectionary, The Most Appropriate Treatment Handbook for Food Processing
Wastewater. Science Forum. (2002)
Chapter 6 Environmental Control and Measures for Industrial Wastewater Treatment
6.1 Outline
In order to prevent pollution from industrial wastewater, the amount of pollutants
discharged into the water areas shall be reduced as much as possible, which is reducing the
points generating pollutants as well as reducing the pollutants at each generating point. To
realize the above mentioned goals, the establishment of the Environmental Quality Standards
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(EQS) based on the Basic Environmental Law, regulations based on the relevant laws,
preparation of inspection and monitoring systems, planning pollution control programs,
organizing pollution control systems in industrial plants, subsidizing pollution control facilities
with public funds, optimizing project site conditions, developing industrial wastewater
treatment technologies, and other actions were taken in the past. The national and local
governments and relevant private sectors play their own roles to promote these actions.
6.2 Settlement of Environmental Quality Standards
The Basic Environmental Law defines the basic concepts of environmental protection
in order to promote the comprehensive preservation of the environment and make sure that
environmental protection is well-programmed. The Law also defines the responsibilities of the
national and local governments, executive agencies, and general public, and it specifies the
basic conditions of environmental protection. Under the Law the governments shall set forth
the desirable environmental quality standards regarding pollution in the air, water, and
environment for protecting human health and preserving living environments. In the
environmental quality standards related to water quality, the human health standard is
uniformly applied to all public water areas. While the living standards set forth the standard
figures of BOD, COD, nitrogen, phosphorus, etc. for each public water area for the segregated
purposes of waters in rivers, lakes, and oceans, the Water Pollution Control Law and other
related laws also stipulate taking the necessary measures to sustain said environmental
quality.
6.3 Regulations by Relevant Laws
1. Water Pollution Control Law
The Water Pollution Control Law aims at protecting the health of the people and
conserving the living environment by regulating effluents from factories in public water areas
and underground waters, and by accelerating the implementation of domestic effluent
measures and other measures. Two types of regulations were set out. One is uniformly applied
all over Japan according to the effluent water concentration, and the other is applied to
designated enclosed water bodies to protect the water quality according to the Area-wide Total
Pollutant Load Control. The effluent standards regulate the concentration of effluents from
factories and other establishments into public waters. The facilities which discharge the
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polluted water or wastewater are designated as Specified Facilities and the factories and other
establishments which possess the Specific Facilities are called the Specified Establishments,
where effluent is regulated by the effluent standards. The Area-wide Total Pollutant Load
Control, which was enacted in 1978 to reduce pollution in large enclosed water bodies, regulates
the pollution load in the designated water areas in addition to the effluent standards. Currently
the regions where the effluent flows from into the Inland Sea, Tokyo Bay, and Ise Bay are
referred to as Designated Areas, where the related prefectures set forth the plans for total
quantitative reduction of the pollutant load of COD, nitrogen, and phosphorus from the
Specified Establishments in accordance with the Fundamental Policy for Reduction of Total
Pollution specified by the Prime Minister.
2. Law Concerning Special Measures for Conservation of the Environment of the Inland Sea
The Law Concerning Special Measures for Conservation of the Environment of the
Inland Sea stipulates the necessary items such as formulating an environmental conservation
plan to accelerate measures effectively protecting the Inland Sea environment. In addition, the
law aims at conserving the Inland Sea environment including special measures regulating the
Specific Facilities; preventing the damage caused by eutrophication; and preserving the natural
seacoast. This law applies to 13 prefectures including Kyoto, Osaka, and Hyogo where effluent
was being discharged into the Inland Sea. There are approval systems for the Specified
Facilities, and the conservation of the natural coast and so on are regulated. The areas
discharging the pollutant load into the Inland Sea are regulated by the total allowable pollutant
loads of COD, nitrogen, and phosphorus the same as with the Water Pollution Control Law.
3. The Law Concerning Special Measures for Conservation of Lake Water Quality
The Law Concerning Special Measures for Conservation of Lake Water Quality aims
at contributing to sustain a healthy and cultural life for the people by protecting the lake water
quality from contamination by polluted water and wastewater by means of formulating the
basic policy on related facilities and regulating the effluent qualities. This law allows
designating lakes where the environmental quality is not currently being conserved, or deemed
to be in danger of getting seriously worse, as Designated Lakes, which require special
comprehensive measures. A total of 10 lakes including Kasumigaura and Biwa are designated.
The load control for COD, nitrogen, and phosphorus is applied to these 10 lakes.
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4. Sewage Law
The Sewage Law stipulates a general sewer construction program for each area. The
law also stipulates the management criteria for constructing the public sewers, river–basin
sewers, and urban storm drainage systems, as well as their operation and maintenance, aiming
at the conservation of public water quality, sound urban development, and upgrading public
hygiene by constructing sewers. There are three types of sewer systems, which are public
sewers, river–basin sewers, and urban storm drainage systems. When industrial wastewater
discharged into public sewer or river–basin sewer systems is in danger of disturbing the
treatment plant functions or damaging the facilities, the responsible parties shall install
pretreatment facilities in compliance with local ordinances.
6.4 Observation and Administrative Measure
1. Water Quality Monitoring of Public Waters
The prefectural governors and Designated Cities’ mayors monitor the water quality of
public water all the time in accordance with the Water Pollution Control Law. The Ministry of
the Environment subsidizes the cost for preparing a measuring plan and investigating water
quality from among the necessary expenses to achieve monitoring.
2. Effluent Observation
The government, prefectural governors, and Designated Cities’ mayors call for reports
from the factories and other establishments or conduct site inspections in compliance with the
Water Pollution Control Law in order to check the observance of effluent standards. The
prefectural governors and Designated Cities’ mayors take the necessary administrative
measures including improvement orders to the factories and other establishments based on the
observation results.
The law regarding establishing pollution control systems in the Specified
Establishments imposes a duty on them to assign general managers in charge of pollution
control affairs, pollution control managers who have the necessary knowledge and skill for
pollution control, and other persons.
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6.6 Subsidies and Others
For the construction of industrial pollution control facilities, part of the construction
funds can be borrowed, under favorable conditions, from lending agencies including the Fund
for Facility Modernization of Small to Medium Size Enterprises, Japan Finance Corporation for
Small Business, and Japan Environment Corporation. Favorable treatment is also given
regarding taxation on the investment.
Chapter 7 Selection of Wastewater Treatment Process and Technology 7.1 Wastewater Treatment System in Food Processing Industry
The pollutants in wastewater are removed by either the removal method using
physical filtration or absorption, or the decomposition method using oxidation or reduction. The
unit operations normally used for the amounts of pollutants in the wastewater treatment are
shown in Figure 1-7-1. The selection of wastewater treatment units and conceptual processing
systems for different types/qualities of wastewater are shown in Figure 1-7-2. The process
performance is confirmed by batch tests, small-scale lab tests, continuous treatability tests on
site, and other methods. When a wastewater treatment process has been used in many
installations and sufficient data are available, the process and performance can be decided
based on the wastewater quality analysis data. When a new process is adopted in a newly built
factory and no test sample is available, wastewater from similar production systems will be
referred to, or the wastewater quality will be estimated from the raw materials, production
process, and yield rate. When a new treatment process is adopted or the volume and/or quality
of the wastewater fluctuate largely, on-site continuous test plant operation to verify the
performance is indispensable in order to avoid risks and evaluate economic efficiency.
7.2 Process Selection
The wastewater treatment systems, having their own properties including reaction
methods, equipment structure, equipment system formation, size, environmental friendliness,
and shape, shall be selected to meet the local geographical and environmental conditions based
on comprehensive evaluations including performance, economics, safety, and maintenance.
When a factory is constructed in an area regulated by stringent effluent regulations such as
near a town, for example, the process and equipment shall be selected to fulfill the
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requirements for odor, noise, external appearance, and installation space along with the
performance for effluent. Where less stringent regulations are applied and ample space is
available, a simple process like a lagoon can be selected.
Figure 1-7-1 Wastewater treatment and pollutants particle sizes
Figure 1-7-2 Wastewater characteristic and wastewater treatment
oil separator
primary treatment
effluent re-use
secondary treatment
tertiary treatment
sludge treatment
oil, etc.
ion,
sand filtrationozone oxidation
Chapter 8 The Construction Plan, Construction Costs, and Operating and Maintenance Costs for Industrial Wastewater Treatment Plants
8.1 Construction Plans
Each wastewater treatment plant runs continuously, keeping pace with factory
production. To meet social needs, products are constantly improved and production processes
are often streamlined, while the surrounding environmental conditions are also changing. Since
predicting these changes when constructing the wastewater treatment plant is difficult and
risky, the construction plan is generally prepared to meet both foreseeable changes and
budgetary needs. From the viewpoint of environmental preservation, wastewater treatment is
as important as production and stable operation of the wastewater treatment plant is vital to
scheduled production. To achieve this, the properties of the wastewater, as well as the volume
and daily and seasonal fluctuations of the pollution loads monitored by similar factories, should
be studied in detail to increase responsiveness at the factory. In order to increase the reliability
of the wastewater treatment plant, countermeasures should be developed to safeguard the
factory against the predictable effluent deterioration and hazards caused by deviation from the
normal pH, flow rate, concentration, pressure, and other factors based on the results of system
safety analysis such as HAZOP (Hazard and Operability Study).
8.2 Costs for Construction, Operation, and Maintenance
The economics, maintenance ease, easy operation, safety, and relevant items shall be
considered at the planning stage of the wastewater treatment plant. The wastewater treatment
plants last, incurring ongoing costs. It is important at the planning stage of a wastewater
treatment plant to evaluate its life-cycle cost including construction costs, utilities consumption,
repair costs, maintenance fees, and decommissioning costs. Fewer malfunctions, quicker
repairs, and lower repair costs are important for easy maintenance.
Chapter 9 Wastewater Treatment Plant Design 9.1 Process Requirements
Attention to the economics and surrounding circumstances is necessary for projections
for the wastewater treatment plant in addition to the functional purification design. Process
design procedures secure all the functions of the wastewater treatment plant, for which the
requirements and typical examination items are shown in Table 1-9-1. The relationships
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between the security of technical reliability and economic requirements at this stage are mostly
potential conflicts of interest that are called trade-offs. Each requirement is basically decided on
the basis of economics.
9.2 Basic Process Design
The numerical design figures, layout, and equipment specifications, which are to be
the basic data for designing the details, shall be confirmed at the basic process design stage. P &
I flow diagrams, plot plans, and utility-flow diagrams are, for instance, major materials.
9.3 Detail Design
The quality, performance, operability, maintenance ease, safety, and other properties
of the wastewater treatment plant are almost fixed at this stage. The construction starts off
generally after the approval of the final drawings. Therefore, safety measures shall particularly
be reviewed at this stage too. The usage of hazardous materials and dangerous places where
risk of suffocation, being caught in machines, and other dangers exist in the wastewater
treatment plant make safety measures important. As for safety measures, hazards (factors
Depreciation
Soil bear ability Each requirement shall be decided on the
Structure, material basis of economics.
Lightening, fire prevention
Securing Leakage
Legal Fire Services Act Labor Standard Act
affairs High Pressure Gases Control Act Safety regulation on boiler and pressure vessel
Laws on dangerous materials Electricity Enterprise Act
Fluctuation charges
Plant, Safety
Operating circumstance
20
causing risk) shall be specified at the design stage and countermeasures for risk should be
considered. The principle of safety design shall be based on the fail-safe principle of mechanical
design, and the introduction of the fool-proof method, which prevents failures caused by human
errors with the reliability and safety of a mechanical system, is useful.1
Reference
1. A. Kumar. Analyzing System Safety. Pollution Engineering, p. 46, June (2000).
Chapter 10 Maintenance and Operation Plan of Wastewater Treatment Plant In wastewater treatment, it is very important to satisfy the effluent standards. In
addition, businesses are recently being requested to take necessary measures for surrounding
environmental conservation, clarifying environmental policy for global environmental
conservation, and being accountable for the results. To secure these requirements, the stable
operation of wastewater treatment is essential. The formalities of internal systems including
criteria preparation, plant maintenance procedures, labor-safety-hygiene managing procedures,
environment management procedures, education programs, operation records, and
accountability are effective.
10.1 Documentation
Documentation is vital to wastewater treatment plant operations and two types of
documents should be prepared for daily operations and emergencies. Operating manuals,
inspection-maintenance manuals, water quality management standards, reporting instructions,
and other necessary items should be provided for scheduled operations. Documentation for
emergencies should provide guidelines for actions in emergencies, including equipment
malfunctions and heavy loads beyond capacity. For each type of emergency, first responders and
responsible teams should be designated and appropriate training is needed. In general, the
entire factory must respond to an emergency and emergency preparedness should be developed
in conjunction with safety and environmental management.
10.2 Plant Maintenance Plan
The maintenance level of wastewater treatment plants should be decided based on the
purposes of the plants and cost-effectiveness. In general, the maintenance of production plants
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1. Preventive Maintenance: daily maintenance, regular inspection, and prognosis for the
scheduling and methods of repair
2. Corrective Maintenance: correction to prevent further occurrence of a problem
3. Breakdown Maintenance: repairing a fault after it occurs
4. Maintenance Prevention: reflecting maintenance activities, upgrading the reliability of
equipment and systems at the design stage
10.3 Labor-Safety-Hygiene Managing Plan
Management of the safety and health of operators is important at wastewater
treatment plants. The facilities, environment, operating procedures, etc. shall be maintained on
a zero accident basis. This means that the organization must prevent accidents and take proper
responses and measures against those accidents that do occur. The safety and hygiene
management plan should also be developed to maintain workers’ positive morale in addition to
their safety.
The environment management systems at wastewater treatment plants shall be
coordinated under the complete systems at the factory to satisfy effluent management and the
management of waste materials, odors, exhaust gases, noise, etc. that are discharged. The
management shall be compatible with the regulations in all respects. When products
containing chemicals are sold or transferred, the MSDS (Material Safety Data Sheet) system,
introduced together with PRTR, asks the supplier to inform the users about the chemicals’
properties and the handling instructions before the transaction. The data sheet provides
instructions for handling, storage, disposal, and transportation of chemicals as well as cautions
related to toxicity for preventing leakage into the environment. Therefore, the user should
check MSDS to confirm the safety of coagulants, neutralization agents, and other materials for
use at wastewater treatment plants when they purchase chemicals.
10.5 Education Program
The education and training programs, and the management of the operators working
at wastewater treatment plants, are important. The required capabilities for plant operators
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are to find problems to be solved, to fulfill their duties, to maintain good human relations, to
solve problems, etc. The educational training is conducted through on-the–job-training,
off-the-job-training, and self-development.
The water quality data, operating conditions, utilities consumption (electricity, water,
chemicals, etc.), and maintenance records at the wastewater treatment plant shall consistently
and continuously be recorded. This data shall be reviewed concerning process improvement and
cost management, which contribute to economizing and environmental conservation. The
stabilization of plant operation, rationalization, and accident prevention are improved by this
data being analyzed by the quality control method. The importance of accountability for
environmental load reduction activities is increasing for businesses who are profiting by
utilizing the environment. Systematic reduction measures in the long term are becoming more
important in addition to understanding the environmental load at the moment.
Chapter 11 Water Quality Monitoring and Outline 11.1 Necessity of Water Quality Monitoring
The effluent from the factories and other establishments into Public Water Areas is
regulated by the Water Pollution Control Law, which prevents pollution in Public Water Areas
in Japan. The reasonable regulations impose the minimum duty on businesses, which results in
the water quality in public waters being conserved by the observance of regulations by
businesses. Accordingly, the Water Pollution Control Law defines the wastewater causing
pollution first, then designates the facilities discharging these wastewaters as Specified
Facilities, and applies the regulations to the Specified Establishments possessing the Specified
Facilities. The effluent from factories and other establishments is regulated either by
“regulation based on concentration-oriented control” for discharge to the Public Water Areas or
by “regulation based on total pollution load control” for discharge to the Specified Water Areas.
For “regulation based on concentration-oriented control,” factories and other establishments
willing to build the Specified Facilities must submit the details to the prefectural governor and
are prohibited from discharging incongruent water into public waters. The businesses must
additionally investigate, analyze, and record the effluent water quality by themselves
(monitoring) in order to justify the situation. For “regulation based on total pollution load
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control,” factories and other establishments in the specified areas are required to fulfill each
area’s Area-wide Total Pollution Load Control and must measure and record the pollutant
quantity in the effluent. Thus, businesses discharging industrial wastewater into Public Water
Areas must monitor the effluent quality to understand the situation and check the conformity
with the specified quality standards. The businesses can fulfill their responsibility by doing this.
11.2 Implementation of Water Quality Monitoring
(1) Implementation of Water Quality Monitoring
The water quality monitoring in accordance with the Basic Environment Law and the
Water Pollution Control Law is broadly divided into two categories as shown in Table 1-11-1.
One is the “monitoring effluent quality” done by businesses, and the other is the “monitoring
water pollution in Public Water Areas” done by local public corporation entities. The
“monitoring effluent quality” done by businesses is divided into two types. One is “monitoring
based on concentration-oriented control”, and the other is “monitoring based on total pollution
load control”. In addition, occasionally monitoring is conducted to support improving
wastewater treatment. The “monitoring of water pollution in Public Water Areas” is to
regularly monitor the pollution in the Public Water Areas (including bottom soil investigation),
underground water quality, effluent quality of factories and other establishments (effluent
monitoring from the Specified Establishments), and others items (aquatic life, nutrients,
agricultural chemicals, chemical compounds, etc.).
(2) Method of Water Quality Monitoring
1) “Monitoring of Effluent Quality” done by Businesses
As described previously, businesses are required to measure and record, by
themselves, the effluent quality (concentration control) and pollutant load (total load control).
While detailed measuring methods for the effluent quality (concentration control) are not
specified, monitoring is necessary because the observance of the rules shall be reported to
prefectural governors and city mayors upon their request, as well as to the inspectors when
on-site inspections are made. The pollutant load monitoring methods for effluent are provided
in detail, such as for COD as shown in Table 1-11-2.
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Table 1-11-2 Measuring methods of effluent COD load and intervals
Monitouring in accordance with Water Pollution Control Law
Effluent Standards
Monitouring in accordance with Law Concerning Special
Enterprise Monitoring on effluent Total Pollutant Load Control Measures for Seto Inland Sea
standards
(includingbottom soil
Local public Monitoring on water investigation) Basic Environment Law
corporation quality in Public Water Regular monitouring of water
entities, etc. Water pollution in underground water Water Pollution Control Law
Effluent quality of factories
Specified Establishments)
Daily average
specified measuring method method (1) is not
appropriate
(3) Specified measuring method In case that measuring
(composit sample of 3 or more method (1) or (2) is
sampling a day) difficult and prefectural Every day, during
m 3 d governor approves discharging
(4) Simplified analyzer
meter
Wastewater
(3) Simplified measuring method In case that measuring
(JIS K0094. 8) method (1) or (2) is
difficult and prefectural
Either (1) not exceeding every 7
Wastewater Either (1) days of discharging
m 3 d volume Either (1) period
Either (1) One or more time
Either (1) not exceeding every 14
Wastewater Either (1) days of discharging
m 3 d volume Either (1) period
Either (1) One or more time
Either (1) not exceeding every 30
Wastewater Either (1) days of discharging
m 3 d volume Either (1) period
Concentration
measuring
25
C: COD concentration in specified effluent (mg/l)
Q: effluent volume of specified effluent (m/d)
2) “Monitoring of Water Pollution in the Public Waters” done by Local Public Corporation
Entities
The governors have a duty to regularly monitor the water quality in the Public Water
Areas. An outline of monitoring procedures on river water quality is shown in Table 1-11-3 as
an example. The examining methods are based on “Water Quality Investigation Procedure”
(September 30, 1971, No.30, Kan-Sui-Kan).
Table 1-11-3 Monitoring of river water
Frequency Frequency Location
of of of
Investigation sampling investigation
Items for human health Standard point and Conduct at stable state
stipulated in EQS day/month 4/day important spot for of effluent when fine
Whole year water usages days is continuing
investigation Necessary items among relatively
Items for human health According Necessary point judging
stipulated in EQS judging to circumstances 4/day from state of pollution Basically collect samples
from state of pollution of effluent at center stream of river.
of effluent For wider river, sampling
Items for living standards Standard point and points shall be settled
stipulated in EQS important spot for at both banks separately.
water usages
13 times Basically collect sample
Whole day Items for living standards at 2 hrs Point with large daily at point of about 20 %
investigation stipulated in EQS interval fluctuation of water depth from
surface
Sampling time zone shall
Interpolating Items for living standards Point requiring be considered at time of
investigation stipulated in EQS interpolation human activities, factory
operation, pollutants
11.3 Auto Water Analyzer for Water Quality Monitoring
In water quality monitoring, auto water analyzers are sometimes used due to the
necessity of continuous measuring and for other similar reasons. Typical analyzers are shown
in Table 1-11-4.
Measuring temperature of liquid
by thermoelectromotive force of
Scattered light method scattered light trough solution
Electrode conductometry
Measuring molybdenum blue absorption of solution after oxidized solution by alkaline potassium peroxodisulfate/ultra violet
Measuring consumed potassium permanganate in solution, which oxidizes pollutant by potentiometric titration (ORP)
Measuring infrared radiation absorption by CO2 generated from combustion of pollutant in solution
Measuring transmissive ultra violet through solution, by which extrapolates COD comparing with COD measured by specified measuring method
Measuring ultra violet absorption of solution after oxidized solution by alkaline potassium peroxodisulfate/ultra violet
Measuring potential difference generated between relative electrodes in solution
Measuring oxygen in solution by membrane electrode of galvanic cell/polarography
Measuring resistance of solution by electrode
Measuring oxidation-reduction of solution by metal electrode
Total nitrogen analyzer
Total phosphorus analyzer
Combustion catalyze oxidation/Infrared radiation absorption method
Water temperature
Total nitrogen
Total phosphorus
Water thermometer
27
REFERENCES
1) Environment Law Research Committee: Environment Six Laws (2002 version).
Chuo-Hoki-Shuppan (2002).
2) OECC: Outline of Technical Training Manual for the Conservation of Aqua Environment
(1998).
3) Global Environmental Centre Foundation: Database of Technology of Continuous Water
Pollution Monitoring in Japan (1995).
Part General Description
Chapter 2 Basic concept and direction of industrial wastewater treatment
Chapter 3 Environmental Consideration for Industrial Wastewater Treatment
Chapter 4 Water Area Conservation and Environmental Assessment
4-1 Environmental Assessment
5.1 Wastewater Treatment by End-Of-Pipe Measures
5.2 Wastewater Treatment by Cleaner Production
Chapter 6 Environmental Control and Measures for Industrial Wastewater Treatment
6.1 Outline
6.3 Regulations by Relevant Laws
6.4 Observation and Administrative Measure
6.5 Establishing Pollution Control Systems in Factories
6.6 Subsidies and Others
7.1 Wastewater Treatment System in Food Processing Industry
7.2 Process Selection
Chapter 8 The Construction Plan, Construction Costs, and Operating and Maintenance Costs for Industrial Wastewater Treatment Plants
8.1 Construction Plans
Chapter 9 Wastewater Treatment Plant Design
9.1 Process Requirements
Chapter 10 Maintenance and Operation Plan of Wastewater Treatment Plant
10.1 Documentation
Chapter 11 Water Quality Monitoring and Outline
11.1 Necessity of Water Quality Monitoring
11.2 Implementation of Water Quality Monitoring
11.3 Auto Water Analyzer for Water Quality Monitoring